44
6. Press the
. m
“R”
or
M >
“R”
button so that the
reading of the laser power meter becomes 6.9 to 7.1 mW, press
the
ENTER/YES “R”
button to save it.
Note:
Do not perform the emission with 7.0 mW more than 15 seconds
continuously.
7. Then, press the
. m
“R”
or
M >
“R”
button to
display “LDPWR CHECK” (C13).
8. Press the
ENTER/YES “R”
button once to display “LD
0.9mW$
”. Check that the reading of the laser power meter
become 0.85 to 0.91 mW.
9. Press the
ENTER/YES “R”
button once more to display “LD
7.0mW$
”. Check that the reading the laser power meter
and digital voltmeter satisfy the specified value.
Note down the digital voltmeter reading value.
Specified Value:
Laser power meter reading : 7.0 ± 0.2 mW
Digital voltmeter reading : Value on the optical pick-up label
±10%
10. Press the
MENU/NO “R”
button to display “LDPWR CHECK”
(C13) and stop the laser emission.
(The
MENU/NO “R”
button is effective at all times to stop the
laser emission)
11. Press the
. m
“R”
or
M >
“R”
button to display “Iop
Write” (C05).
12. Press the
ENTER/YES “R”
button. When the display becomes
Ref=@@@.@ (@ is an arbitrary number), press the
ENTER/
YES “R”
button to display “Measu=@@@.@” (@ is an
arbitrary number).
13. The numbers which can be changed will blink. Input the Iop
value noted down at step 9.
To select the number : Press the
. m
“R”
or
M >
“R”
button.
To select the digit : Press the
[REC MODE]
button.
14. When the
ENTER/YES “R”
button is pressed, “Complete!” will
be displayed momentarily. The value will be recorded in the
non-volatile memory and the display will become “Iop Write”
(C05).
Note:
After step 4, each time the
ENTER/YES “R”
button is pressed, the
display will be switched “LD 0.7mW$
”, “LD 7.5mW$
”,
and “LD Wp
$
”. Nothing needs to be performed here.
Adjustment Location: BD (MD) board (see page 47)
11. Iop NV SAVE
Write the reference values in the nonvolatile memory to perform
“Iop compare”. As this involves rewriting the reference values, do
not perform this procedure except when adjusting the laser power
during replacement of the optical pick-up and when replacing the
IC102. Otherwise the optical pick-up check may deteriorate.
Note:
Perform this function with the optical pick-up set at room
temperature.
Procedure:
1. Press the
. m
“R”
or
M >
“R”
button to display “Iop
NV Save” (C06).
2. Press the
ENTER/YES “R”
button and display “Iop [stop]”.
3. After the display changes to “Iop =xxsave?”, press the
ENTER/
12. TRAVERSE ADJUSTMENT
Connection:
Procedure:
1. Connect an oscilloscope to CN105 pin
4
(TE) and CN105
pin
6
(VC) on the BD (MD) board.
2. Load a disc (any available on the market). (Refer to Note 1)
3. Press the
M
“R”
button to move the optical pick-up outside
the pit.
4. Press the
. m
“R”
or
M >
“R”
button to display “EF
MO ADJUST” (C07).
5. Press the
ENTER/YES “R”
button to display “EFB =
MO-
R”.
(Laser power READ power/Focus servo ON/tracking servo
OFF/spindle (S) servo ON)
6. Press the
. m
“R”
or
M >
“R”
button so that the
waveform of the oscilloscope becomes the specified value.
(When the
. m
“R”
or
M >
“R”
button is pressed,
the
of “EFB=
” changes and the waveform changes) In
this adjustment, waveform varies at intervals of approx. 2%.
Adjust the waveform so that the specified value is satisfied as
much as possible.
(Read power traverse adjustment)
Traverse Waveform
7. Press the
ENTER/YES “R”
button and save the result of ad-
justment to the non-volatile memory (“EFB =
SAVE” will
be displayed for a moment. Then “EFB =
MO-W” will be
displayed).
Note 1:
Data will be erased during MO reading if a recorded disc is
used in this adjustment.
Note 2:
If the traverse waveform is not clear, connect the oscilloscope
as shown in the following figure so that it can be seen more
clearly.
KMS262A
20101
B0825
lOP=82.5 mA in this case
lOP (mA) = Digital voltmeter reading (mV)/1 (
Ω
)
(Optical pick-up label)
For details of the method for
checking this value, refer to
“8. Recording and Displaying
the Iop Information”
+
–
oscilloscope
(DC range)
V: 0.1 V/div
H: 10 ms/div
BD (MD) board
CN105 pin
4
(TE)
CN105 pin
6
(VC)
A
B
VC
Specification A = B
YES “R”
button.
4. After “Complete!” is displayed momentarily, the display changes
to “Iop 7.0 mW”.
5. After the display changes to “Iop=yysave?”, press the
ENTER/
YES “R”
button.
6. When “Complete!” is displayed, it means that Iop NV saving
has been completed.
+
–
oscilloscope
(DC range)
10 pF
330 k
Ω
CN105 pin
4
(TE)
CN105 pin
6
(VC)
BD (MD) board